condition mean min max ZT0-3 25.81396666666667 24.01155 27.865000000000002 ZT4-7 22.65945 22.65945 22.65945 ZT8-11 24.208750000000002 24.208750000000002 24.208750000000002 ZT12-15 33.525725 33.17275 33.8787 ZT16-19 26.81995 26.81995 26.81995 ZT20-23 28.2485 28.2485 28.2485